Here is Millenicom answer, just minutes ago....
14:05:06 Thank you for contacting us. An operator will be with you shortly...
14:05:06 Visitor: How long are customers allowed to suspend use....This is for a Canadian snowbird that is in the states only 5 months a year.
14:05:28 Operator Nathaniel joined the chat
14:05:37 Nathaniel: Hello and thanks for using online chat. My name is Nate
14:05:49 Visitor: Looking specifically at the Verizon 4620 hotspot
14:05:55 Nathaniel: To answer your question, vacation is 3 months at most
14:06:13 Nathaniel: Cancellation is easier for time longer then that and so its just an activation fee + monthly
14:06:33 Visitor: can it then be activated for 1 mointh, then suspended for 3 more?
14:06:51 Nathaniel: No, 3 months per year
14:07:06 Visitor: thanks